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These conditions lead to heat fluxes to the chamber walls that can reach as high as 10 MW/m2 during the combustion period.
For a given mass of fuel within the cylinder, higher heat transfer to the combustion chamber walls will lower the average combustion gas temperature and pressure,
Heat transfer between the unbumed charge and the chamber walls in spark-ignition engines affects the onset of knock which, by limiting the compression ratio, also influences power and efficiency.
Heat transfer is now from the cylinder gases to the chamber walls.
An example of how the heat-transfer rate to the total combustion chamber walls varies throughout the four-stroke operating cycle of a spark-ignition engine is shown in Fig. 14-9.
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